ios - Update NSError UserInfo -

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i'm trying update nserror object more information. example, api call may fail , want update error object returned api class view controller information (method name caused error, client message, additional info). there isn't setter method userinfo dictionary , trying set value dictionary raises exception (not key value code compliant believe). thought creating new nserror object updated user info, wasn't sure if might lose information.

question

what's best way update user info dictionary of nserror object?

easiest way mutable copy of userinfo dictionary , add whatever that. have create new nserror (since there not setuserinfo: method) same domain , code original one.


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